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Re: [Xen-users] Save and restore DomU (hvm) on Dom0 restart. CentOS 5.5

To: Todd Deshane <todd.deshane@xxxxxxx>
Subject: Re: [Xen-users] Save and restore DomU (hvm) on Dom0 restart. CentOS 5.5 + Xen 3.4.3
From: Alexander Zherdev <azherdev@xxxxxxxxx>
Date: Thu, 10 Feb 2011 16:24:55 -0800 (PST)
Cc: xen-users@xxxxxxxxxxxxxxxxxxx
Delivery-date: Thu, 10 Feb 2011 16:26:22 -0800
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Thank you for responding Todd,

Do I need to have the PV drivers to save the state?

What I want to happen is:

When shutdown/restart is initiated:

1. Xen pauses all running VMs
2. Xen saves the state of all VMs to disk (memory and cpu state)
3. Xen shuts down
4. System shutsdown/restarts

When system is started/restarted:

1. Xen starts
2. Loads the state of all the VMs
3. Resumes VMs

I do *NOT* want the VMs to know they were shutdown. Hickup with network connections/time is the only thing that will be perceived.
Alexander Zherdev

From: Todd Deshane <todd.deshane@xxxxxxx>
To: Alexander Zherdev <azherdev@xxxxxxxxx>
Cc: xen-users@xxxxxxxxxxxxxxxxxxx
Sent: Tue, February 8, 2011 8:32:48 PM
Subject: Re: [Xen-users] Save and restore DomU (hvm) on Dom0 restart. CentOS 5.5 + Xen 3.4.3

On Sat, Feb 5, 2011 at 11:55 PM, Alexander Zherdev <azherdev@xxxxxxxxx> wrote:
> What are the settings that I must specify to have DomU be saved and then
> automatically started on reboot of the physical server?
> In my /etc/sysconfi/xendomains it points to a save folder (which does not
> exist)
> My configuration files are located at /vm/cfg/vm-xxxx/vm-xxxx.xen
> In my config file I have:
> But, after calling "shutdown -r now", the DomUs are turned off and do not
> start.
> My DomU's are Windows 2003 Servers running in HVM virtualization.

You need pv drivers for the shutdown to work properly. So, for example
you could use the gplpv drivers for windows.

For a domain to be started at boot, there needs to be a symlink to its
config file in /etc/xen/auto

Hope that helps.


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